Rockwell Automation 20-COMM-R Remote I/O Adapter - Manual (Page 38)

4-2 Using Discrete and Block Transfer I/O
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
Understanding the I/O Image Figure 4.1 (1/4 rack) and Figure 4.2 (1/2 rack) show how data is transmitted
between a controller and drive.
Figure 4.1 Example I/O Image Using 1/4 Rack Configuration
Rack Size Reference Source Feedback Destination Datalinks
1/4 Block Transfer I/O Block Transfer I/O Block Transfer I/O
1/2 Discrete I/O Discrete and Block Transfer I/O Block Transfer I/O
Controller Scanner Adapter PowerFlex Drive
Remote I/O DPI
Output
Image
Data
Files
Block Transfer Messages
Message
Handler
Discrete I/O
Block Transfer I/O
0 BT Status
1 Logic Status
0 - 1 Feedback
2 - 3 Datalink A1
4 - 5 Datalink A2
6 - 7 Datalink B1
8 - 9 Datalink B2
10 - 11 Datalink C1
12 - 13 Datalink C2
14 - 15 Datalink D1
16 - 17 Datalink D2
Discrete I/O
Block Transfer I/O
Wo
rd
0 - 1 Reference
2 - 3 Datalink A1
4 - 5 Datalink A2
6 - 7 Datalink B1
8 - 9 Datalink B2
10 - 11 Datalink C1
12 - 13 Datalink C2
14 - 15 Datalink D1
16 - 17 Datalink D2
Wo
rd
Wo
rd
0 BT Control
1 Logic Command Wo
rd
Data
Files
Input
Image
Data
Files
Logic Command
Reference
Data In A1
Data In A2
Data In B1
Data In B2
Data In C1
Data In C2
Data In D1
Data In D2
Logic Status
Feedback
Data Out A1
Data Out A2
Data Out B1
Data Out B2
Data Out C1
Data Out C2
Data Out D1
Data Out D2